From the Lidl non-food Aisle: DCF77 Radio Controlled Clock
https://en.wikipedia.org/wiki/Radio_clock
http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-radio-time-signal
http://www.timetools.co.uk/2013/07/23/the-dcf-77-german-time-and-frequency-broadcast/